arch/sh/mm/init.c

   1 /*
   2  * linux/arch/sh/mm/init.c
   3  *
   4  *  Copyright (C) 1999  Niibe Yutaka
   5  *  Copyright (C) 2002 - 2010  Paul Mundt
   6  *
   7  *  Based on linux/arch/i386/mm/init.c:
   8  *   Copyright (C) 1995  Linus Torvalds
   9  */
  10 #include <linux/mm.h>
  11 #include <linux/swap.h>
  12 #include <linux/init.h>
  13 #include <linux/gfp.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/pagemap.h>
  17 #include <linux/percpu.h>
  18 #include <linux/io.h>
  19 #include <linux/memblock.h>
  20 #include <linux/dma-mapping.h>
  21 #include <asm/mmu_context.h>
  22 #include <asm/mmzone.h>
  23 #include <asm/kexec.h>
  24 #include <asm/tlb.h>
  25 #include <asm/cacheflush.h>
  26 #include <asm/sections.h>
  27 #include <asm/setup.h>
  28 #include <asm/cache.h>
  29 #include <asm/sizes.h>
  30
  31 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
  32 pgd_t swapper_pg_dir[PTRS_PER_PGD];
  33
  34 void __init generic_mem_init(void)
  35 {
  36         memblock_add(__MEMORY_START, __MEMORY_SIZE);
  37 }
  38
  39 void __init __weak plat_mem_setup(void)
  40 {
  41         /* Nothing to see here, move along. */
  42 }
  43
  44 #ifdef CONFIG_MMU
  45 static pte_t *__get_pte_phys(unsigned long addr)
  46 {
  47         pgd_t *pgd;
  48         pud_t *pud;
  49         pmd_t *pmd;
  50
  51         pgd = pgd_offset_k(addr);
  52         if (pgd_none(*pgd)) {
  53                 pgd_ERROR(*pgd);
  54                 return NULL;
  55         }
  56
  57         pud = pud_alloc(NULL, pgd, addr);
  58         if (unlikely(!pud)) {
  59                 pud_ERROR(*pud);
  60                 return NULL;
  61         }
  62
  63         pmd = pmd_alloc(NULL, pud, addr);
  64         if (unlikely(!pmd)) {
  65                 pmd_ERROR(*pmd);
  66                 return NULL;
  67         }
  68
  69         return pte_offset_kernel(pmd, addr);
  70 }
  71
  72 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
  73 {
  74         pte_t *pte;
  75
  76         pte = __get_pte_phys(addr);
  77         if (!pte_none(*pte)) {
  78                 pte_ERROR(*pte);
  79                 return;
  80         }
  81
  82         set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
  83         local_flush_tlb_one(get_asid(), addr);
  84
  85         if (pgprot_val(prot) & _PAGE_WIRED)
  86                 tlb_wire_entry(NULL, addr, *pte);
  87 }
  88
  89 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
  90 {
  91         pte_t *pte;
  92
  93         pte = __get_pte_phys(addr);
  94
  95         if (pgprot_val(prot) & _PAGE_WIRED)
  96                 tlb_unwire_entry();
  97
  98         set_pte(pte, pfn_pte(0, __pgprot(0)));
  99         local_flush_tlb_one(get_asid(), addr);
 100 }
 101
 102 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
 103 {
 104         unsigned long address = __fix_to_virt(idx);
 105
 106         if (idx >= __end_of_fixed_addresses) {
 107                 BUG();
 108                 return;
 109         }
 110
 111         set_pte_phys(address, phys, prot);
 112 }
 113
 114 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
 115 {
 116         unsigned long address = __fix_to_virt(idx);
 117
 118         if (idx >= __end_of_fixed_addresses) {
 119                 BUG();
 120                 return;
 121         }
 122
 123         clear_pte_phys(address, prot);
 124 }
 125
 126 static pmd_t * __init one_md_table_init(pud_t *pud)
 127 {
 128         if (pud_none(*pud)) {
 129                 pmd_t *pmd;
 130
 131                 pmd = alloc_bootmem_pages(PAGE_SIZE);
 132                 pud_populate(&init_mm, pud, pmd);
 133                 BUG_ON(pmd != pmd_offset(pud, 0));
 134         }
 135
 136         return pmd_offset(pud, 0);
 137 }
 138
 139 static pte_t * __init one_page_table_init(pmd_t *pmd)
 140 {
 141         if (pmd_none(*pmd)) {
 142                 pte_t *pte;
 143
 144                 pte = alloc_bootmem_pages(PAGE_SIZE);
 145                 pmd_populate_kernel(&init_mm, pmd, pte);
 146                 BUG_ON(pte != pte_offset_kernel(pmd, 0));
 147         }
 148
 149         return pte_offset_kernel(pmd, 0);
 150 }
 151
 152 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
 153                                             unsigned long vaddr, pte_t *lastpte)
 154 {
 155         return pte;
 156 }
 157
 158 void __init page_table_range_init(unsigned long start, unsigned long end,
 159                                          pgd_t *pgd_base)
 160 {
 161         pgd_t *pgd;
 162         pud_t *pud;
 163         pmd_t *pmd;
 164         pte_t *pte = NULL;
 165         int i, j, k;
 166         unsigned long vaddr;
 167
 168         vaddr = start;
 169         i = __pgd_offset(vaddr);
 170         j = __pud_offset(vaddr);
 171         k = __pmd_offset(vaddr);
 172         pgd = pgd_base + i;
 173
 174         for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
 175                 pud = (pud_t *)pgd;
 176                 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
 177                         pmd = one_md_table_init(pud);
 178 #ifndef __PAGETABLE_PMD_FOLDED
 179                         pmd += k;
 180 #endif
 181                         for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
 182                                 pte = page_table_kmap_check(one_page_table_init(pmd),
 183                                                             pmd, vaddr, pte);
 184                                 vaddr += PMD_SIZE;
 185                         }
 186                         k = 0;
 187                 }
 188                 j = 0;
 189         }
 190 }
 191 #endif  /* CONFIG_MMU */
 192
 193 void __init allocate_pgdat(unsigned int nid)
 194 {
 195         unsigned long start_pfn, end_pfn;
 196 #ifdef CONFIG_NEED_MULTIPLE_NODES
 197         unsigned long phys;
 198 #endif
 199
 200         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
 201
 202 #ifdef CONFIG_NEED_MULTIPLE_NODES
 203         phys = __memblock_alloc_base(sizeof(struct pglist_data),
 204                                 SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
 205         /* Retry with all of system memory */
 206         if (!phys)
 207                 phys = __memblock_alloc_base(sizeof(struct pglist_data),
 208                                         SMP_CACHE_BYTES, memblock_end_of_DRAM());
 209         if (!phys)
 210                 panic("Can't allocate pgdat for node %d\n", nid);
 211
 212         NODE_DATA(nid) = __va(phys);
 213         memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
 214
 215         NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
 216 #endif
 217
 218         NODE_DATA(nid)->node_start_pfn = start_pfn;
 219         NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
 220 }
 221
 222 static void __init bootmem_init_one_node(unsigned int nid)
 223 {
 224         unsigned long total_pages, paddr;
 225         unsigned long end_pfn;
 226         struct pglist_data *p;
 227         int i;
 228
 229         p = NODE_DATA(nid);
 230
 231         /* Nothing to do.. */
 232         if (!p->node_spanned_pages)
 233                 return;
 234
 235         end_pfn = p->node_start_pfn + p->node_spanned_pages;
 236
 237         total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
 238
 239         paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
 240         if (!paddr)
 241                 panic("Can't allocate bootmap for nid[%d]\n", nid);
 242
 243         init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
 244
 245         free_bootmem_with_active_regions(nid, end_pfn);
 246
 247         /*
 248          * XXX Handle initial reservations for the system memory node
 249          * only for the moment, we'll refactor this later for handling
 250          * reservations in other nodes.
 251          */
 252         if (nid == 0) {
 253                 /* Reserve the sections we're already using. */
 254                 for (i = 0; i < memblock.reserved.cnt; i++)
 255                         reserve_bootmem(memblock.reserved.region[i].base,
 256                                         memblock_size_bytes(&memblock.reserved, i),
 257                                         BOOTMEM_DEFAULT);
 258         }
 259
 260         sparse_memory_present_with_active_regions(nid);
 261 }
 262
 263 static void __init do_init_bootmem(void)
 264 {
 265         int i;
 266
 267         /* Add active regions with valid PFNs. */
 268         for (i = 0; i < memblock.memory.cnt; i++) {
 269                 unsigned long start_pfn, end_pfn;
 270                 start_pfn = memblock.memory.region[i].base >> PAGE_SHIFT;
 271                 end_pfn = start_pfn + memblock_size_pages(&memblock.memory, i);
 272                 __add_active_range(0, start_pfn, end_pfn);
 273         }
 274
 275         /* All of system RAM sits in node 0 for the non-NUMA case */
 276         allocate_pgdat(0);
 277         node_set_online(0);
 278
 279         plat_mem_setup();
 280
 281         for_each_online_node(i)
 282                 bootmem_init_one_node(i);
 283
 284         sparse_init();
 285 }
 286
 287 static void __init early_reserve_mem(void)
 288 {
 289         unsigned long start_pfn;
 290
 291         /*
 292          * Partially used pages are not usable - thus
 293          * we are rounding upwards:
 294          */
 295         start_pfn = PFN_UP(__pa(_end));
 296
 297         /*
 298          * Reserve the kernel text and Reserve the bootmem bitmap. We do
 299          * this in two steps (first step was init_bootmem()), because
 300          * this catches the (definitely buggy) case of us accidentally
 301          * initializing the bootmem allocator with an invalid RAM area.
 302          */
 303         memblock_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET,
 304                     (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) -
 305                     (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET));
 306
 307         /*
 308          * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
 309          */
 310         if (CONFIG_ZERO_PAGE_OFFSET != 0)
 311                 memblock_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET);
 312
 313         /*
 314          * Handle additional early reservations
 315          */
 316         check_for_initrd();
 317         reserve_crashkernel();
 318 }
 319
 320 void __init paging_init(void)
 321 {
 322         unsigned long max_zone_pfns[MAX_NR_ZONES];
 323         unsigned long vaddr, end;
 324         int nid;
 325
 326         memblock_init();
 327
 328         sh_mv.mv_mem_init();
 329
 330         early_reserve_mem();
 331
 332         memblock_enforce_memory_limit(memory_limit);
 333         memblock_analyze();
 334
 335         memblock_dump_all();
 336
 337         /*
 338          * Determine low and high memory ranges:
 339          */
 340         max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
 341         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 342
 343         nodes_clear(node_online_map);
 344
 345         memory_start = (unsigned long)__va(__MEMORY_START);
 346         memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
 347
 348         uncached_init();
 349         pmb_init();
 350         do_init_bootmem();
 351         ioremap_fixed_init();
 352
 353         /* We don't need to map the kernel through the TLB, as
 354          * it is permanatly mapped using P1. So clear the
 355          * entire pgd. */
 356         memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 357
 358         /* Set an initial value for the MMU.TTB so we don't have to
 359          * check for a null value. */
 360         set_TTB(swapper_pg_dir);
 361
 362         /*
 363          * Populate the relevant portions of swapper_pg_dir so that
 364          * we can use the fixmap entries without calling kmalloc.
 365          * pte's will be filled in by __set_fixmap().
 366          */
 367         vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
 368         end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
 369         page_table_range_init(vaddr, end, swapper_pg_dir);
 370
 371         kmap_coherent_init();
 372
 373         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 374
 375         for_each_online_node(nid) {
 376                 pg_data_t *pgdat = NODE_DATA(nid);
 377                 unsigned long low, start_pfn;
 378
 379                 start_pfn = pgdat->bdata->node_min_pfn;
 380                 low = pgdat->bdata->node_low_pfn;
 381
 382                 if (max_zone_pfns[ZONE_NORMAL] < low)
 383                         max_zone_pfns[ZONE_NORMAL] = low;
 384
 385                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
 386                        nid, start_pfn, low);
 387         }
 388
 389         free_area_init_nodes(max_zone_pfns);
 390 }
 391
 392 /*
 393  * Early initialization for any I/O MMUs we might have.
 394  */
 395 static void __init iommu_init(void)
 396 {
 397         no_iommu_init();
 398 }
 399
 400 unsigned int mem_init_done = 0;
 401
 402 void __init mem_init(void)
 403 {
 404         int codesize, datasize, initsize;
 405         int nid;
 406
 407         iommu_init();
 408
 409         num_physpages = 0;
 410         high_memory = NULL;
 411
 412         for_each_online_node(nid) {
 413                 pg_data_t *pgdat = NODE_DATA(nid);
 414                 unsigned long node_pages = 0;
 415                 void *node_high_memory;
 416
 417                 num_physpages += pgdat->node_present_pages;
 418
 419                 if (pgdat->node_spanned_pages)
 420                         node_pages = free_all_bootmem_node(pgdat);
 421
 422                 totalram_pages += node_pages;
 423
 424                 node_high_memory = (void *)__va((pgdat->node_start_pfn +
 425                                                  pgdat->node_spanned_pages) <<
 426                                                  PAGE_SHIFT);
 427                 if (node_high_memory > high_memory)
 428                         high_memory = node_high_memory;
 429         }
 430
 431         /* Set this up early, so we can take care of the zero page */
 432         cpu_cache_init();
 433
 434         /* clear the zero-page */
 435         memset(empty_zero_page, 0, PAGE_SIZE);
 436         __flush_wback_region(empty_zero_page, PAGE_SIZE);
 437
 438         vsyscall_init();
 439
 440         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
 441         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 442         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 443
 444         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 445                "%dk data, %dk init)\n",
 446                 nr_free_pages() << (PAGE_SHIFT-10),
 447                 num_physpages << (PAGE_SHIFT-10),
 448                 codesize >> 10,
 449                 datasize >> 10,
 450                 initsize >> 10);
 451
 452         printk(KERN_INFO "virtual kernel memory layout:\n"
 453                 "    fixmap  : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 454 #ifdef CONFIG_HIGHMEM
 455                 "    pkmap   : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 456 #endif
 457                 "    vmalloc : 0x%08lx - 0x%08lx   (%4ld MB)\n"
 458                 "    lowmem  : 0x%08lx - 0x%08lx   (%4ld MB) (cached)\n"
 459 #ifdef CONFIG_UNCACHED_MAPPING
 460                 "            : 0x%08lx - 0x%08lx   (%4ld MB) (uncached)\n"
 461 #endif
 462                 "      .init : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 463                 "      .data : 0x%08lx - 0x%08lx   (%4ld kB)\n"
 464                 "      .text : 0x%08lx - 0x%08lx   (%4ld kB)\n",
 465                 FIXADDR_START, FIXADDR_TOP,
 466                 (FIXADDR_TOP - FIXADDR_START) >> 10,
 467
 468 #ifdef CONFIG_HIGHMEM
 469                 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
 470                 (LAST_PKMAP*PAGE_SIZE) >> 10,
 471 #endif
 472
 473                 (unsigned long)VMALLOC_START, VMALLOC_END,
 474                 (VMALLOC_END - VMALLOC_START) >> 20,
 475
 476                 (unsigned long)memory_start, (unsigned long)high_memory,
 477                 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
 478
 479 #ifdef CONFIG_UNCACHED_MAPPING
 480                 uncached_start, uncached_end, uncached_size >> 20,
 481 #endif
 482
 483                 (unsigned long)&__init_begin, (unsigned long)&__init_end,
 484                 ((unsigned long)&__init_end -
 485                  (unsigned long)&__init_begin) >> 10,
 486
 487                 (unsigned long)&_etext, (unsigned long)&_edata,
 488                 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
 489
 490                 (unsigned long)&_text, (unsigned long)&_etext,
 491                 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
 492
 493         mem_init_done = 1;
 494 }
 495
 496 void free_initmem(void)
 497 {
 498         unsigned long addr;
 499
 500         addr = (unsigned long)(&__init_begin);
 501         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
 502                 ClearPageReserved(virt_to_page(addr));
 503                 init_page_count(virt_to_page(addr));
 504                 free_page(addr);
 505                 totalram_pages++;
 506         }
 507         printk("Freeing unused kernel memory: %ldk freed\n",
 508                ((unsigned long)&__init_end -
 509                 (unsigned long)&__init_begin) >> 10);
 510 }
 511
 512 #ifdef CONFIG_BLK_DEV_INITRD
 513 void free_initrd_mem(unsigned long start, unsigned long end)
 514 {
 515         unsigned long p;
 516         for (p = start; p < end; p += PAGE_SIZE) {
 517                 ClearPageReserved(virt_to_page(p));
 518                 init_page_count(virt_to_page(p));
 519                 free_page(p);
 520                 totalram_pages++;
 521         }
 522         printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 523 }
 524 #endif
 525
 526 #ifdef CONFIG_MEMORY_HOTPLUG
 527 int arch_add_memory(int nid, u64 start, u64 size)
 528 {
 529         pg_data_t *pgdat;
 530         unsigned long start_pfn = start >> PAGE_SHIFT;
 531         unsigned long nr_pages = size >> PAGE_SHIFT;
 532         int ret;
 533
 534         pgdat = NODE_DATA(nid);
 535
 536         /* We only have ZONE_NORMAL, so this is easy.. */
 537         ret = __add_pages(nid, pgdat->node_zones + ZONE_NORMAL,
 538                                 start_pfn, nr_pages);
 539         if (unlikely(ret))
 540                 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
 541
 542         return ret;
 543 }
 544 EXPORT_SYMBOL_GPL(arch_add_memory);
 545
 546 #ifdef CONFIG_NUMA
 547 int memory_add_physaddr_to_nid(u64 addr)
 548 {
 549         /* Node 0 for now.. */
 550         return 0;
 551 }
 552 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 553 #endif
 554
 555 #endif /* CONFIG_MEMORY_HOTPLUG */